EP0668569A2 - Ecron tactile avec sensibilité réduiteaux selections parasites - Google Patents

Ecron tactile avec sensibilité réduiteaux selections parasites Download PDF

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Publication number
EP0668569A2
EP0668569A2 EP95102193A EP95102193A EP0668569A2 EP 0668569 A2 EP0668569 A2 EP 0668569A2 EP 95102193 A EP95102193 A EP 95102193A EP 95102193 A EP95102193 A EP 95102193A EP 0668569 A2 EP0668569 A2 EP 0668569A2
Authority
EP
European Patent Office
Prior art keywords
base
cover
display opening
sidewalls
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95102193A
Other languages
German (de)
English (en)
Other versions
EP0668569A3 (fr
Inventor
Mark Casebolt
James M. Dahl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spacelabs Medical Inc
Original Assignee
Spacelabs Medical Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spacelabs Medical Inc filed Critical Spacelabs Medical Inc
Publication of EP0668569A2 publication Critical patent/EP0668569A2/fr
Publication of EP0668569A3 publication Critical patent/EP0668569A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen

Definitions

  • the present invention relates to touch screens and, more particularly, to touch screens having reduced sensitivity to spurious selections.
  • Touch screens are typically mounted to cathode ray tube (CRT) displays. They usually include a plurality of LEDs arranged along two orthogonal edges of the CRT display to emit infrared light across the face of the CRT display. A plurality of detectors corresponding to the plurality of LEDs are positioned along the remaining two edges of the CRT display.
  • CRT cathode ray tube
  • a user contacts a region of the CRT display, thereby breaking at least one of the light beams in each orthogonal direction.
  • the corresponding detectors along the edges detect the broken beams.
  • Each detector corresponds to an x or y-axis coordinate.
  • Such touch screen assemblies typically require each LED in the rows of LEDs to be individually aligned such that the beam of light from each is emitted toward the appropriate detector.
  • the LED is often oriented by hand, such that the central portion of the beam is directed precisely toward the corresponding detector. Touch screen assemblies can therefore be difficult, time consuming and expensive to fabricate.
  • Such designs are based upon the use of leaded through hole low cost parts; i.e., "TI” LEDs and detectors.
  • the designs take advantage of the flexibility of leaded through hole parts by using the lead spring to orient the devices.
  • Other devices are available, such as RIGHT ANGLE parts which are more expensive.
  • Use of "STANDARD” TI parts is preferred for coat reasons.
  • "TI" style phototransistors are used, because one object of the design is to minimize production costs.
  • LEDs that are surface mounted with elaborate lens structures. After the LEDs and detectors are so oriented, their orientation is maintained by their semirigid leads. Over time, the LEDs and detectors may drift from their precise orientation due to vibration, fatigue of the leads, and/or other effects such as temperature. Such failures may require that the assembly be repaired or replaced, increasing costs of operation.
  • the operation of the touch screen assembly may be impaired by such misalignment.
  • the central portion of a beam of light from one LED is slightly misdirected, a large portion of the energy from that LED does not reach its corresponding detector.
  • the sensitivity of the assembly may be impaired.
  • some of the misdirected light may impinge upon a detector corresponding to a different LED. The light energy impinging upon such a detector will reduce the sensitivity of the detectory by making it more difficult to detect when the light beam corresponding to that detector is broken.
  • a touch screen assembly includes a substantially rectangular base and a substantially rectangular cover having mounting platforms therebetween. Sidewalls of the base and cover define a display opening for viewing a CRT display.
  • a plurality of LEDs are mounted to two of the platforms along orthogonal edges of the display opening.
  • Corresponding detectors are mounted on the other two platforms along the remaining two edges of the display opening.
  • guide portions are formed in sidewalls of each of the base and the cover such that when the base and cover are interconnected, the guide portions together form cylindrical guides extending from the distal ends of the LEDs toward the display opening.
  • the cylindrical guides at the LEDs prevent divergence of light beams from the LEDs by helping to collimate the light.
  • the cylindrical guides at the detectors block off-axis light to prevent loss of sensitivity of the touch screen assembly.
  • the base also includes integral support pedestals having a first end connected to the base and provide a platform at the second end to support the LEDs and detectors to prevent fatigue and misalignment.
  • the second end advantageously includes a curved surface adapted to conform to the bodies of the LEDs and detectors.
  • the cover advantageously connects to the base using pivot hooks which allow the cover to be detached to provide access to the LEDs and detectors without removing the touch screen assembly from the CRT display.
  • the guide portions and pedestals provide support to the LEDs and detectors and help to align the LEDs and detectors in their desired orientations. Because the guides and support pedestals are integral to the base and cover and engage the LEDs and detectors as the cover is attached to the base, the LEDs and detectors are aligned with their desired orientation simultaneously with the attachment of the cover to the base, thus reducing the need for each of the LEDs and detectors to be aligned by hand.
  • the preferred embodiment of the inventive device includes a base 40, a cover 42 and a mounting board 44, with the base and cover connected and the mounting board sandwiched therebetween.
  • the base includes four longitudinal side pieces. The four side pieces are interconnected in a generally rectangular configuration with sidewalls of the pieces defining a display opening 46 conforming substantially in shape to a typical CRT display screen.
  • the mounting board 44 includes four orthogonal planar platforms interconnected in a substantially rectangular configuration so that a CRT display will be visible.
  • a plurality of LEDs 48, 54 are mounted along edges 47 of two of the platforms adjacent the display opening 46.
  • the LEDs 48, 56 emit light transversely across the display opening 46 toward a plurality of optical detectors 50 and 54 mounted along opposite edges 49 of the remaining two platforms adjacent the display opening 46.
  • Each of the detectors is oriented to receive light emitted from its corresponding LED.
  • the base 40 includes a guide half 58 for each of the LEDs 48, a guide half 60 for each of the optical detectors 50, a guide half 62 for each of the LEDs 56 and a guide half 64 for each of the detectors 54.
  • Each of the guide halves 58, 60, 62 and 64 is a half cylinder integrally formed along one of the sidewalls defining the display opening. The linear dimensions of the guide halves extend orthogonally to the sidewalls and away from the display aperture.
  • the guide halves extend toward the edges 47, 49 of the mounting board with a section of the cylindrical portion partially encircling a distal portion of their respective LEDs, as discussed below.
  • the cover 42 shown in Figures 4A and 4B, is substantially rectangular, with four sidewalls 68, 69, 73, 75 defining a generally rectangular display opening 45 to conform to the outline of typical CRT displays.
  • Guide halves 70, 72, 74, 76 corresponding to the guide halves 58, 60, 62, 64 in the base are formed along each of the sidewalls 68, 69, 73, 75 of the display opening.
  • Each of the guide halves is a half cylinder, substantially a mirror image of the guide halves in the base and integrally formed along one of the sidewalls defining the cover display opening 45.
  • each of the guide halves in the base 40 corresponds to and is aligned with a corresponding guide half in the cover 42.
  • guide halves in the base will be referred to herein as the base guide halves and guide halves in the cover will be referred to as cover guide halves.
  • Figure 5 shows a detailed cross section of a section of the touch screen assembly surrounding one of the LEDs 48 and one of the detectors 50. It will be understood that the following description applies equally to those portions of the inventive assembly surrounding other LEDs 56 or optical detectors 54 and their corresponding guide halves 64, 62, 74, 76.
  • each of the cover guide halves 70 mates to a corresponding base guide half 58 to form a cylindrical guide 78 which is axially aligned with a body 80 of the corresponding LED 48.
  • the circumference of the cylindrical guide 78 is preferably approximately equivalent to, but slightly larger than, the circumference of the corresponding body 80 of the LED 48.
  • the body 80 preferably extends slightly at its output end into the cylindrical guide 78 when the device is assembled. In this position, the cylindrical guide 78 surrounds a portion of the LED body 80 to hold it in alignment and light emitted from the LED 48 is directed through the cylindrical guide 78. Light exiting the cylindrical guide is thus directed transversely across the display opening 46 toward the detector 50 with its corresponding cylindrical guide 79.
  • the LED 48 Prior to assembly of the complete touch screen assembly of Figure 5, the LED 48 is held in rough alignment by its semi-rigid leads 82, The cylindrical guide 78 improves alignment and provides support by forcing the LED body 80 to be aligned normally to the base aperture. Additional precision of alignment is aided by a support pedestal 84 which engages the LED body 80 near its base 89.
  • the support pedestal 84 is preferably formed integrally to the base 40 and includes an upper surface 81 curved to mate with the LED body 80.
  • a corresponding support pedestal 85 engages the detector to aid in its alignment.
  • the cylindrical guides 78, 79 and the support pedestals 84, 85 provide additional support to prevent problems associated with vibrations and general fatigue of the semi-rigid lead 82, such as a drifting out of alignment.
  • a shield 91 having four sidewalls of an infrared transmissive material and conforming to the sidewalls mates to the touch screen assembly. The shield protects the cylindrical guides, sources and detectors, while permitting light to travel from the sources to the detectors substantially unobstructed.
  • the cover 42 detachably connects to the base 40 in a fashion that simultaneously engages the support pedestals 84 to the LEDs and detectors and forms the cylindrical guides 78, 79 around the corresponding LEDs and detectors.
  • the LEDs and detectors are supported and aligned.
  • detachable connection is achieved with a trio of edge hooks 86, 88 and 90 integral to the cover 42 which engage a trio of corresponding hook slots 92, 94 and 96 in the base 40 as best seen in Figures 4A and 5.
  • a pair of retaining catches 98, 100 on an opposite side of the cover 42 extend to penetrate a pair of slots 104, 102 in the base 40.
  • the cover 42 is attached to the base 40 by inserting the pivot hooks 86, 88, 90 into the hook slots 92, 94, 96 with the cover initially tilted at an angle to the base 40.
  • the cover is then pivoted such that the retaining catches 98, 100 move toward and enter the retaining slots 102, 104 in the cover.
  • lips 106, 108 engage a shoulder 103 integral to the base and prevent the cover 42 from pivoting relative to the base 40.
  • the pivot hooks 86, 88, 90 thus remain held by the hook slots 92, 94, 96 and the cover is fixedly connected to the base 40.
  • a pair of access apertures 110, 112 are formed in a sidewall of the base 40.
  • the apertures are preferably of sufficient size to allow a user to reach the retaining catches and press them inwardly toward the base aperture 66 thereby releasing the lips 106, 108 from engagement with the lower surface of the base. With the lips no longer engaged, the cover may be rotated upwardly releasing the pivot hooks so that the cover can be removed.
  • the cover 42 When the cover 42 is pivoted toward alignment with the base as described above, the upper surfaces of the support pedestals 84, 85 engage the LED and detector bodies 80 and the base guide halves 58, 60, 62, 64 and cover guide halves 70, 72, 74, 76 are brought together around the ends of the LEDs and detectors.
  • the semi-rigid leads 82 of the LEDs and detectors flex where necessary to permit the support pedestals and cylindrical guides to redirect the LEDs and detectors and align them more precisely.
  • the mounting board is mounted to the cover 42 using four similar board catches 112, 114, 116, 118 which engage four corresponding slots 120, 122, 124, 126 in the mounting board 44, as shown in greater detail in Figure 5.
  • a lip 128 engages the mounting board to hold it in place.
  • the board catch 114 may be bent outwardly, away from the LED by applying pressure through the access apertures 110, 112. Because the corresponding slot 120 is sufficiently large to permit the entire end portion of the retaining catch 114 to exit, the mounting board 40 may then be removed by sliding it away from the cover.
  • the mounting board 44 may thus be accessed and removed without removing the base from the CRT and without requiring any special tools advantageously reducing the cost and complexity of performing repairs to the mounting board 44.
  • the cylindrical guide 78 In addition to providing mechanical support and alignment aid for the LEDs and detectors, the cylindrical guide 78 also aids in columnization of the beams from the LEDs and in blocking off-axis light from the detectors. This effect will be explained with respect to Figure 6. It will be understood that Figure 6, is not drawn to scale in order to present more clearly the operation of the device.
  • the LED 48 when the LED 48 ; is energized, it emits a beam of light 130 toward a corresponding detector 50 ; .
  • the optical beam 130 would spread as shown by the dashed lines in Figure 6. It will be understood by one skilled in the art that the spread of the beam from the LED 48 may be defined in a number of fashions (e.g., the angle could be defined as the -3dB point of the light intensity). This prevents contamination of adjacent touch screens as well.
  • light from the LED 48 may be directed toward adjacent detectors 58 i-1 , 50 i+l as shown by arrows 139.
  • misdirected light and light from beam spreading is known to cause errors and loss of sensitivity.
  • the cylindrical guide 78 With the cylindrical guide 78 ; in front of the LED, off-axis light is blocked, thereby reducing the effective spread of the beam as shown in the solid lines of Figure 6. Thus, the cylindrical guide 78 ; reduces the effective spreading of a beam from the LED. Columnisation of light by the cylindrical guides will also prevent contamination of adjacent touch screens as wall by blocking light from spreading out of the plane of the touch screen. This prevents lights from one of the LEDs 48 from exiting the touch screen assembly and being detected by a detector in a different touch screen assembly.
  • the cylindrical guide advantageously reduces problems caused when the beam from the LED is skewed, such as might occur if the die of the LED was offset with respect to the body.
  • skewed light as shown by the broken line 140 may cause substantial light energy to be directed to an improper detector, even if the LED body is aligned properly.
  • the skewed light is blocked by the cylindrical guide 78 and the beam is effectively directed toward the corresponding detector 50.
  • the cylindrical guides 78 in front of the detectors 50 also reduce effects of off-axis light caused by user selection.
  • the beam 130 from the LED 48 to the detector 58 is broken. In some instances, however, the beam may only be redirected off-axis as outlined by the rays 134, 136. In the absence of the cylindrical guide 78' ; - 1 , this off-axis light would strike the adjacent detector 58 ; - 1 and perhaps cause an error. As shown, the cylindrical guide 78' ; - 1 blocks the off-axis light and prevents it from striking the detector 58 i-1 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP95102193A 1994-02-17 1995-02-16 Ecron tactile avec sensibilité réduiteaux selections parasites. Withdrawn EP0668569A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US198046 1994-02-17
US08/198,046 US5515083A (en) 1994-02-17 1994-02-17 Touch screen having reduced sensitivity to spurious selections

Publications (2)

Publication Number Publication Date
EP0668569A2 true EP0668569A2 (fr) 1995-08-23
EP0668569A3 EP0668569A3 (fr) 1996-02-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102193A Withdrawn EP0668569A3 (fr) 1994-02-17 1995-02-16 Ecron tactile avec sensibilité réduiteaux selections parasites.

Country Status (3)

Country Link
US (1) US5515083A (fr)
EP (1) EP0668569A3 (fr)
CA (1) CA2142774A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884691A2 (fr) * 1997-06-13 1998-12-16 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Dispositif de sortie pour signaux résultants d'une opération de toucher
WO2002095668A1 (fr) * 2001-05-22 2002-11-28 Palm, Inc. Ensemble d'affichage tactile
US7852430B1 (en) 2001-11-29 2010-12-14 Palm, Inc. Light guide spacers for backlighting a reflective display
US7859518B1 (en) 2001-06-04 2010-12-28 Palm, Inc. Interface for interaction with display visible from both sides
US8384674B1 (en) 2001-01-30 2013-02-26 Hewlett-Packard Development Company, L.P. Integrated enclosure/touch screen assembly
US9489018B2 (en) 2000-11-30 2016-11-08 Qualcomm Incorporated Input detection system for a portable electronic device

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US6172667B1 (en) 1998-03-19 2001-01-09 Michel Sayag Optically-based touch screen input device
US6677934B1 (en) 1999-07-30 2004-01-13 L-3 Communications Infrared touch panel with improved sunlight rejection
US6512512B1 (en) * 1999-07-31 2003-01-28 Litton Systems, Inc. Touch panel with improved optical performance
US6664950B1 (en) 1999-11-17 2003-12-16 L-3 Communications Resistive touch panel using removable, tensioned top layer
US20030013522A1 (en) * 2001-07-10 2003-01-16 Muir David Hugh Automatic electronic display alignment
US6478432B1 (en) 2001-07-13 2002-11-12 Chad D. Dyner Dynamically generated interactive real imaging device
US7410138B2 (en) * 2003-03-14 2008-08-12 Tgr Intellectual Properties, Llc Display adjustably positionable about swivel and pivot axes
US20040204635A1 (en) * 2003-04-10 2004-10-14 Scharf Tom D. Devices and methods for the annotation of physiological data with associated observational data
US20060256092A1 (en) * 2005-05-12 2006-11-16 Lee Daniel J Reconfigurable interactive interface device including an optical display and optical touchpad that use aerogel to direct light in a desired direction
US20080093536A1 (en) * 2006-10-24 2008-04-24 David Campbell Brower Reduction of solar interference in an infrared touch system
US20080221930A1 (en) 2007-03-09 2008-09-11 Spacelabs Medical, Inc. Health data collection tool
JP2009140177A (ja) * 2007-12-05 2009-06-25 Kyocera Mita Corp 操作表示装置
EP2245523B1 (fr) * 2008-01-11 2016-11-16 O-Net Wave Touch Limited Dispositif a effleurement
US20100127140A1 (en) * 2008-01-23 2010-05-27 Gary Smith Suspension for a pressure sensitive touch display or panel
CN101534614A (zh) * 2008-03-14 2009-09-16 鹏智科技(深圳)有限公司 电子装置
US20120098794A1 (en) * 2008-10-31 2012-04-26 Rpo Pty Limited Transmissive Body
US8427439B2 (en) * 2009-04-13 2013-04-23 Microsoft Corporation Avoiding optical effects of touch on liquid crystal display
TWI439902B (zh) * 2009-06-16 2014-06-01 Raydium Semiconductor Corp 光學式觸控裝置及其運作方法
IN2012DN03108A (fr) 2009-10-16 2015-09-18 Spacelabs Healthcare Llc
US9604020B2 (en) 2009-10-16 2017-03-28 Spacelabs Healthcare Llc Integrated, extendable anesthesia system
EP2496381A4 (fr) * 2009-11-02 2017-07-05 Megastir Technologies LLC Soudage par friction-malaxage hors position d'un boîtier et d'un tube ou tuyau de petit diamètre
US20110115748A1 (en) * 2009-11-18 2011-05-19 Amlogic Co., Ltd. Infrared Touch Screen
US8674837B2 (en) 2010-03-21 2014-03-18 Spacelabs Healthcare Llc Multi-display bedside monitoring system
US9047747B2 (en) 2010-11-19 2015-06-02 Spacelabs Healthcare Llc Dual serial bus interface
US9629566B2 (en) 2011-03-11 2017-04-25 Spacelabs Healthcare Llc Methods and systems to determine multi-parameter managed alarm hierarchy during patient monitoring
WO2013056157A1 (fr) * 2011-10-13 2013-04-18 Autodesk, Inc. Plateau de table tactile multipoint sensible à la proximité
US10987026B2 (en) 2013-05-30 2021-04-27 Spacelabs Healthcare Llc Capnography module with automatic switching between mainstream and sidestream monitoring
US11182023B2 (en) 2015-01-28 2021-11-23 Flatfrog Laboratories Ab Dynamic touch quarantine frames
WO2016130074A1 (fr) 2015-02-09 2016-08-18 Flatfrog Laboratories Ab Système tactile optique comprenant des moyens de projection et de détection de faisceaux de lumière au-dessus et à l'intérieur d'un panneau de transmission
EP4075246B1 (fr) 2015-12-09 2024-07-03 FlatFrog Laboratories AB Stylet pour système tactile optique
KR102495467B1 (ko) * 2016-12-07 2023-02-06 플라트프로그 라보라토리즈 에이비 개선된 터치 장치
CN116679845A (zh) 2017-02-06 2023-09-01 平蛙实验室股份公司 触摸感测装置
US20180275830A1 (en) 2017-03-22 2018-09-27 Flatfrog Laboratories Ab Object characterisation for touch displays
CN110663015A (zh) 2017-03-28 2020-01-07 平蛙实验室股份公司 触摸感应装置和用于组装的方法
CN117311543A (zh) 2017-09-01 2023-12-29 平蛙实验室股份公司 触摸感测设备
WO2019172826A1 (fr) 2018-03-05 2019-09-12 Flatfrog Laboratories Ab Appareil de détection tactile perfectionné
WO2020153890A1 (fr) 2019-01-25 2020-07-30 Flatfrog Laboratories Ab Terminal de visioconférence son procédé de fonctionnement
CN115039063A (zh) 2020-02-10 2022-09-09 平蛙实验室股份公司 改进的触摸感测设备

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EP0422361A2 (fr) * 1989-08-17 1991-04-17 Sony Corporation Dispositif d'entrée de données pour équipements électroniques compacts

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884691A2 (fr) * 1997-06-13 1998-12-16 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Dispositif de sortie pour signaux résultants d'une opération de toucher
EP0884691A3 (fr) * 1997-06-13 1999-03-03 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Dispositif de sortie pour signaux résultants d'une opération de toucher
US6366276B1 (en) 1997-06-13 2002-04-02 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Touch operation signal output device
US9489018B2 (en) 2000-11-30 2016-11-08 Qualcomm Incorporated Input detection system for a portable electronic device
US8384674B1 (en) 2001-01-30 2013-02-26 Hewlett-Packard Development Company, L.P. Integrated enclosure/touch screen assembly
WO2002095668A1 (fr) * 2001-05-22 2002-11-28 Palm, Inc. Ensemble d'affichage tactile
US6992659B2 (en) 2001-05-22 2006-01-31 Palmone, Inc. High transparency integrated enclosure touch screen assembly for a portable hand held device
US8134534B1 (en) 2001-05-22 2012-03-13 Hewlett-Packard Development Company, L.P. High transparency integrated enclosure touch screen assembly for a portable hand held device
US7859518B1 (en) 2001-06-04 2010-12-28 Palm, Inc. Interface for interaction with display visible from both sides
US7852430B1 (en) 2001-11-29 2010-12-14 Palm, Inc. Light guide spacers for backlighting a reflective display

Also Published As

Publication number Publication date
EP0668569A3 (fr) 1996-02-07
US5515083A (en) 1996-05-07
CA2142774A1 (fr) 1995-08-18

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